User's Manual

MTU Instruction
for Neptune and Schlumberger Water Meters
Supplies and Tools Required
See Publication 471-2000, General
Installation and Wiring Guidelines for a
complete list of recommended tools and
supplies for MTU Installation.
Installation Procedure
Step 1 - Select a mounting location for
the MTU that will allow optimum signal
transmission, and install any needed
wiring. Be sure to follow all General
Installation and Wiring Guidelines as
outlined in Publication 471-2000.
Step 2 – Select the wiring diagram that
applies to the meter you are connecting
and make the appropriate wiring
connections.
a. Direct Wiring to Meter - MTU
wiring is supplied stripped to a
standard length that fits water
meters with screw terminals.
Simply wrap the wires around the
screw terminal and tighten the
screw. It is recommended that the
screws be tightened to no more
than 4 – 5 in-lbs. Over-tightening
the screw can stress and possibly
fracture the wire.
b. Water Meter with Integral Cable -
If the water meter is supplied with
an integral cable and a cable-to-
cable splice is necessary, use a
gel-filled wire splice designed for
outdoor (moisture applications) to
seal the individual connections.
Note: When connecting a dual port MTU
to a compound meter, connect port 1
(black jacket) to the primary, or high-flow
register and port 2 (grey jacket) to the
secondary or low-flow register.
Step 3 – Make a final visual check of the
wiring from the MTU to the meter register.
Verify that the cable routing is neat,
secure and professional.
Step 4 – Once installation and wiring are
complete, program the MTU using the
STAR Programmer Software and your
MTU Programmer.
NTG MTU
The NTG MTU is a special purpose MTU
designed specifically to support the
advanced capabilities of Neptune’s E-
Coder solid-state register. This MTU
provides the following special functions
when coupled to an E-Coder Plus register
and properly programmed.
• 8-Digit Readings – The NTG MTU
reads and transmits the full 8-digit
reading from the E-Coder at the
programmed read interval, typically
every 12 hours. A full range of
read intervals are supported,
including temporary read intervals
for temporary monitoring purposes.
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